Spring定时任务：@Schedule

Spring定时任务：@Schedule Spring定时任务：@Schedule

在开发中经常遇到一些定时任务，比如到点自动爬取数据、到点自动执行清除数据库信息之类，使用spring的Schedule功能就可以实现需求。

快速入门：

从https://cron.qqe2.com/里面根据自己的需求获取cron表达式

编写对应的代码：

在启动类上面加一个注解：

执行效果：

相关参数：

多重任务（开启线程池）：

如果需要多个定时任务需要重写SchedulingConfigurer接口：

package com.github.binarywang.demo.wx.mp.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;


@Configuration
public class ScheduledConfig implements SchedulingConfigurer {

    
    private static final int TASK_POOL_SIZE = 5;
    
    private static final String TASK_THREAD_PREFIX = "cron-task-";

    @Override
    public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
        ThreadPoolTaskScheduler taskPool = new ThreadPoolTaskScheduler();
        taskPool.setPoolSize(TASK_POOL_SIZE);
        taskPool.setThreadNamePrefix(TASK_THREAD_PREFIX);
        taskPool.initialize();
        scheduledTaskRegistrar.setTaskScheduler(taskPool);
    }
}

测试代码：

package com.github.binarywang.demo.wx.mp.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;


@Slf4j
@Component
public class myCron {
    @Scheduled(cron = "0/5 * * * * ? ")
    public void saying() {
        log.debug("=========  这里是定时任务   ================");

    }
    @Scheduled(cron = "0/7 * * * * ? ")
    public void saying2() {
        log.error("=========  7秒的这里是定时任务   ================");
    }
    @Scheduled(cron = "10 * * * * ? ")
    public void saying3() {
        log.warn("=========  10秒的这里是定时任务   ================");
    }

}

效果：

2021-10-24 10:05:42.004 ERROR 8684 --- [    cron-task-2] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:05:45.001 DEBUG 8684 --- [    cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:05:49.006 ERROR 8684 --- [    cron-task-1] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:05:50.004 DEBUG 8684 --- [    cron-task-4] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:05:55.002 DEBUG 8684 --- [    cron-task-4] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:05:56.007 ERROR 8684 --- [    cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:06:00.010 DEBUG 8684 --- [    cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:06:00.010 ERROR 8684 --- [    cron-task-2] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:06:05.006 DEBUG 8684 --- [    cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:06:07.004 ERROR 8684 --- [    cron-task-5] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:06:10.002 DEBUG 8684 --- [    cron-task-4] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:06:10.002  WARN 8684 --- [    cron-task-1] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  10秒的这里是定时任务   ================
2021-10-24 10:06:14.005 ERROR 8684 --- [    cron-task-2] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:06:15.012 DEBUG 8684 --- [    cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:06:20.012 DEBUG 8684 --- [    cron-task-3] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:06:21.014 ERROR 8684 --- [    cron-task-5] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  7秒的这里是定时任务   ================
2021-10-24 10:06:25.004 DEBUG 8684 --- [    cron-task-1] c.g.binarywang.demo.wx.mp.utils.myCron   : =========  这里是定时任务   ================
2021-10-24 10:06:27.864  INFO 8684 --- [       Thread-2] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'

Process finished with exit code 130